EasyDoesIt said:
I wish u were here to help too.
As far as i know the seat tube on the frame is 27 mm whereas the seatpost is 27.2mm, can't seem to get a 27 mm seatpost over here and didn't think it'd be that hard to move. I managed to get it to move nearly 10 mm down last night so will see how it goes like that, if i need it to go down more i'll use your advice, thanks for your help.
Well, this is APPARENTLY after-the-fact, but you can readily reduce a MANY older 27.2 seatpins to 27.0 since it appears that the
blank used was the same for most sizes. This is
not applicable with a most MODERN seatpins.
So, while this "reduction process" is not applicable for your carbon fiber seatpin, if you want to reduce an older, aluminum seatpin, you just need some emery cloth + time ... OR, a flat file + emery cloth + less time. Wrap some masking tape above the insertion level ... wrap the lower/exposed portion with the emery cloth, grab the emery cloth, turn the seatpost in the emery cloth cylinder you have created until the seatpost's diameter is reduced to ~27.0 ... OR, use a file to shave the area in question, first, and then polish it with the emery cloth until the seatpin is reduced to the proper diameter.
I have found with SOME steel older frames that the prior owner had over-tightened the collar AFTER inserting a seatpin that is the wrong size. IF the sides of the slot on the back of the seat tube are not parallel, then this is undoubtedly what may have happened since MOST
steel Colnagos use 27.2 seatposts AND this may be the source of your difficulty.
IF SO, take a
large (e.g., 12") screwdriver, and insert it into the slot in the back of the seat tube, and VERY gently nudge it so that the sides of the slot are parallel.